/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.horizon.kafka.v010;

import java.util.Collections;
import java.util.Properties;

import org.apache.kafka.clients.consumer.ConsumerConfig;
import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.apache.kafka.clients.consumer.ConsumerRecords;
import org.apache.kafka.clients.consumer.KafkaConsumer;


public class Consumer {
    private final KafkaConsumer<String, String> consumer;
    private final String topic;
    
    public Consumer(String topic) {
        Properties props = new Properties();
        props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, "172.17.11.154:9092,172.17.11.155:9092,172.17.11.156:9092");
        props.put(ConsumerConfig.GROUP_ID_CONFIG, Constants.GROUP);
        props.put(ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG, "true");
        props.put(ConsumerConfig.AUTO_COMMIT_INTERVAL_MS_CONFIG, "1000");
        props.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");//latest,earliest
        props.put(ConsumerConfig.SESSION_TIMEOUT_MS_CONFIG, "30000");
        props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer");
        props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer");
        
        consumer = new KafkaConsumer<>(props);
        this.topic = topic; 
    }
    
    public void consumerMsg(){
    	try {
			consumer.subscribe(Collections.singletonList(this.topic));
			while(true){
				ConsumerRecords<String, String> records = consumer.poll(1000);
				//System.out.println("runing...");
				for (ConsumerRecord<String, String> record : records) {
				    System.out.println("Received message: (" + record.key() + ", " + record.value() + ") at partition "+record.partition()+" offset " + record.offset());
				}
			}
			
		} catch (Exception e) {
			e.printStackTrace();
		}
    }
    
    public static void main(String[] args) {
    	Consumer Consumer = new Consumer(Constants.TOPIC);
    	Consumer.consumerMsg();
	}
    


}
